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2. STUDY AREA CHARACTERISTICS <br /> <br />Table 2.2.5-1 shows the annual energy consumption on a per million gallon treated basis for <br />10 years. Also shown is the typical range of energy consumption for an activated sludge <br />secondary treatment plant. Energy consumption in 1997 was unusually low because it was a <br />particularly wet year. Rainfall for the year totaled 42 inches, measured at the Eugene <br />Airport, as opposed to 26 inches, which is typical for the Eugene-Springfield area from <br />January to June (1995-96 Weathernet, Inc., data from 1961-90). As a result, although more <br />wastewater was treated, additional energy was required simply for pumping the <br />wastewater, not necessarily additional pollutant removal, which is the more energy- <br />intensive portion of the process. <br /> <br />TABLE 2.2.5-1 <br />Energy Consumption During Fiscal Years 1994-2003 <br />MWMC Facilities Plan, Eugene-Springfield <br /> <br /> Unit Energy Consumption <br /> Year (kWh/MG) <br /> <br /> FY 1994 1,386 <br /> FY 1995 1,221 <br /> FY 1996 1014 <br /> FY 1997 914 <br /> FY 1998 1094 <br /> FY 1999 1085 <br /> FY 2000 1059 <br /> FY 2001 1075 <br /> FY 2002 1006 <br /> FY 2003 1105 <br /> Typical range for activated sludge plant 1,300 to 2,300 <br /> <br />Additionally, the energy audit determined that management of peak demands (i.e., the <br />instantaneous power requirement) is excellent at the facility. The WPCF's load factor (the <br />ratio of average energy use -to peak energy use) is approximately 77 percent, a number <br />significantly above typical treatment plants and nearing the 80 percent load factors of such <br />highly managed facilities as hospitals. High peak demand requirements (i.e., low load <br />factors) are typically a major contributorto the overall cost of energy in a treatment plant. <br />To reduce energy demand at the WPCF, MWMC employs management practices such as <br />control schemes that inhibit the simultaneous operation of large horsepower motors during <br />equipment staging, and operator awareness training aimed at eliminating overlapping <br />operation of large energy users during startup and shutdown procedures. <br /> <br />2.2.6 Water Resources <br />The following discussion focuses on water quality parameters including maximum water <br />temperature, bacteria, heavy metals and nutrients. Each represents a class of pollutants that <br /> <br /> MWMC 2.0 REV23.DOC 2-17 <br /> <br /> <br />